Expansible chamber motor with fluid actuated cam controlled inlet and exhaust valves



May 25, 1948- w H. G. STONE 2,442,101

EXPANSIBLE CHAMBR MOTOR WITH FLUID ACTUATED CAM CONTROLLED INLETl ANDEXHAUST VALVES Filed Jan. 19, 1945 A TTOANEV.

Patented May 25, 1948 v .2,442,1017l l ExPANsrLE CHAMBER Moron WITH tFLUID AofrUATED CAM '1CONTRQLLED.; nirLEtiAismEXHAUSTVALVE,s Y WilliamH. G., Stone, Tacoma,v Application January. 19, 1945, serial'NQ..513,538 1 1j This invention relatesto a motor to be operated from .anydesired -iiuid under pressure, such as steam, compressedair, etc.,andhas for its principal objectthe provision of a simple and highlyleiiicient motor mechanism in which the valv'es'will--bepressure-operated so that they vention; reference is had totheaccompanying drawing which forms -ay part `f hereof. Like numeralsrefer. to like partsin vall views of the drawingand throughouttheldescription.V

In the drawing Fig... 1 is a cross section through the improved pressuremotor; and

Fig. 2 is a detail section takenon the line 2-'2,` Fig. 1.v

The improved. motor consists of `a formed:v therein. As illustrated',the Tolocky is formed .fwith two cylinders.- I I and.v I2.v Acrankcase/I3 zis loolted'` to theengine block. Hoy-meansr of; suitable crank`caseI bolts I4.V

Azpiston l5 is mounted'in. each of the cylinders, lfand. IIL from eachof which a -piston rod.

t6 extends. Thepiston rods I6 operate through guide.. members..V Il Aand.terminate in .connecting linlrsv la... The. links.,l8 4are connectedwith thel opposite. extremities of a, rocker. armr I9,I which is keyedor otherwise .secured on .a crank shaft k2l).`

Thus, reciprocationofthe pistons I5` in the cyljnderswill impartanoscillating motion, to thecrankshaft 2l).

cylinder .f block Ill having a pluralityofpressure cylinders The pistonsarefreciprocated by means of fluid pressure ,entering through vanintake.- 2 I, which feeds. an intakepassage 22leading,to.an intake.

valira-23 yeachfcylinder.1 The ,pressure is, releiied from theycylinders,l by means-v of, exhaust VBVQS 21,1,V there being one=.exhaust A.valve .24 in each cylinder.- The ,exhaust valves...24,.,exhaust to. an exhaust VMassage 25 ,leadingA .tu any Vexhaustmeniield 2.6...

The valves 23 Lvand. 24..-are operatedfby means of a valve cam bar 21,which is reciprocallyV mounted-ina yalyebar housing 28 across the headof the cylinders II and I2. The cam bar 21 fis provided jwithI anYelongatedjintake cam 29A and'ktwo exhausts-cams 3l).l The stems voftheValves 23"and 24 terminate in box-like crossheaclsk 3 fthrough e111-0f.'wif-.11th'theV Cem. bar., 2l masses,... Each ofthe .Crossheeds 3lvis.,pr wille 'With'.abarinabos. 32,-'. The.b9.SSS,.32'-beer againstthe;

The' exhaust valves ,24 are .censtantlr urged.

upwardly toward their seats @hy 'means V of exhaust n valve .springs33ar1dtheintalse Valesre consternly rsedownwerdly toward theirgseaisjbrmeansof. intekeivalve .srtines 34:'

The ,earns onthecam bar'Z'I-iare so positioned-y that', whenV the barisnmcve'jd axially innen@ di; reotiomit will p' 0961.1' the 'intakeyvalve 23j-,of cylinder I2 yandthe exhaustValve 24fof,"cylinder II- A`and,jwhen movedjintheother direction, 'iti-willfopen the exhaust Valvev24ocylindr IZA-lancithe; intake y valve`33fof "cylinder I I: The cambar-'21 is moved -axially by rneansof control` pistons `3`5secure1 onthe vtwo extremitiestliere'ofby The Ypistons 35 operate ,in operating,cylinders 36 to 'which -uid lunder `pressure is Vconducted?byI means of#pressure conduits 31; whichcommnicate through the wailsof therespective cylinde-rs?- II and I2-'immediately above-thlowermostfposition of the'pistonslStherein Operation Let usassume that,thepi-stons- I5.areinthe.r positions .illustratedin Fig.. 1, and.. that.ihiidlsiln-` der pressure. is..f1owing..into.f.the intakel I.. This.`

fhi-idsvsz-ill` owthroughthe openvalveenfof the. cylinder I2;` forcingthefpistonj `I 5.-thereirr .down-- Ward-ly. This downward.movement.,wilt.tiitlthe1 rocker ,arm I9 fso.V .asl to.- force.theipistonitsuma,

war.elly:v in cylinder l t... :exhaust-the. fludffrom. theslatter.cylinder; through the open. valve ,24..therein.

This V movenient. or .cy-cle. Wills continue..

the..` piston liao-1E cylinder I2; passes.. belomsthe.,

open-ine .oftthe pressurerre' this occurs.l l fluid' .under` press righkhand.` operaties Cylinder 35;

4fiore/in th;

pis', n, .35, g.`trier. eintothe. A left...vl 'rnisdshiftsrthegcam... erto; Cause-.the riehthen rtm1/Sensoren thaexhaust .Velten Oftcylinder.leed-te, causer the :Cami 29 @www fthe iniakeavawe .23 -or cyl; index; II The ypressure is., thereby? conducted terlinderfl l t0..forcerthaipistenf; l5. downward,

therein, until it admitsfpressnre through the left conduitltothealcftperat' ec de 3 to return-the valve,baritottsoriemalspos .While-v.only two; cylinders haverheen.- illustrati-.-

ed,add1-tiona1l banksrotwol cylinders` each. icaribeen described andillustrated herein, it is de-.-

sired to be understood' that the same may be varied, within the scope ofthe appended clamis, without departing from the spirit of the invention.

l. A pressure motor comprising: a pair oi cylinders; a power pistonreciprocally mounted 1n each of said cylinders; an intake valve foradmitting fluid under pressure to each cylinder; an exhaust valve fordischarging fluid from each cylinder; a"

reciprocally mounted cam bar; cams on said bar Afor operating saidvalves; an operating piston on saidcam bar; an operating cylindersurroundingV said piston; means for admitting uid under pressure to saidoperating cylinder when one of the POWer pistons has reached apre-determined point invits cylinder to `causesaid operating piston tomove said cam bar in, one direction; and means for returning. said'cambar in the other direction when said'v power piston has reached a tdifferent point in its cylinder.

2. A pressure-operated motor comprising: a

crank shaft; a pair of 4power cylinders; a power piston in each of saidcylinders; means connecting said pistons to said YcrankY shaft to impartmovement to the latter; an intake valve in each power cylinder; anexhaust valve in each powerY Y crank shaft; a pair of power cylinders; apower piston in each of said cylinders; means connecting said pistons tosaid crank shaft to impart movement to the latter; aniintake valve ineach power cylinder; an exhaust valve in each power cylinder; aslidablymounted valve bar; cams on said bar positioned to alternately open andclose theA valves of Yeach cylinder; pressure-operated means forreciprocating said cam bar; and means for admittingiluid under .pressureto'said pressure-operatedY meansV from the power cylinders when thepistons in the latter have reached 'a pre-determined point therein tomove said bar in one direction; and means controlled by said powerpistons for moving said bar'in the other direction;

4;. A pressure-operated motor comprising: a crank shaft; a pairof `powercylinders; `a power piston in each of said cylinders; meansconnecting'said pistons to said crank shaft to impart movement to thelatter; an intake valve in each lCfVA .A Y t .piston in each of saidcylinders; means connect- Having thus described the invention-what isclaimed and desired secured by'Letters Patent is :f

of its stroke so that fluidunder pressure will ow from ahead of thepiston of one of the power cylinders to an operating cylinder toreciprocate the cam bar in one direction and from the other operatingcylinder to a point behind the piston in the other power lcylinder toexhaust the :duid therefrom whenever one of the power pistons approachesit-s extreme position. f Y

5. A pressure-operated motor comprising: a crank shaft; a pair of powercylinders; a powerl ingsaid pistons-"to said crankshaft to impartmovement-to the latter; an intake valve in each 'power cylinder; anexhaust valve in each' power cylinder; a stem projecting from eachvalve; a

,..crossheadvon each-stem; a cam bar extending through all of said crossheads; intake cams on said cam bar positioned to contact the cross headscrankshaft; aipairof power cylinders; afpowerf power cylinder; anexhaustrvalve in each power cylinder; a slidably mountedvalve bar; camson said bar positioned to alternately open andclose the valves of eachcylinder; a pair of 'operating pistons connected with said cain bar; anoperating Vcylinder surrounding each' of said! latter pistons;

a conduit extending from each'of the operating cylinders through thewall ofconeV ofthe power cylindersso as tolle uncoveredbythe powerpiston when the latter approaches the extremity 6. A pressure-operatedmotor comprising: aiY

crank shaft; ka pair o f power cylinders; a power.- piston in each ofsaid cylinders; means connecting said pistons to ysaid crank shaft toimpart movement to theV latter; an-intake valvein. each power cylinder;an exhaust valve ineaCh powerV cylinder; a' stem projecting jfrom eachvalve a cross head on eachstem; a cam bar'extending through all of saidcross heads;'intake camson said cam bar positioned to contactthe crossheads of the intake valves; exhaust camson said cam; bar positioned tocontact the cross headson the exhaust valves; a cam operating cylinder;apis-v ton in said latter cylinder connected with isaidcam bar; a conduitfrom one iof Ysaid operating; cylinders to said power cylinder; y there'bei/riga',A port in the latter controlling the formerso .the pressurewill be admitted to said operatingcylinder when the power piston reachesYa pre-deterr.' Y

mined position inV that power cylinder'to force said cam bar in onedirection; and'means; for; returning said cambarin the other directionat a predetermined position' of said powerl pistons."

7.A 'pressure-operated motore comprising:` a'

piston in each of s'aidcylindersg means connecting said pistons to saidcrank shafttoi'inipart movement to the latter; an intake valve in eachpower cylinder; anexhaust valve in achpower Y cylinder; a stem`projecting from Veach valve; av cross head'on each stem; alongitudinally movable c'a'm bar' extending through all of the crossVheads; cams on said bar arranged to c'ontactfthe. crossheadssofas toalternately open an'di'close the'int'ake and exhaust valves ofthe twocylinders as said bar is reciprocated back'and'forth; Ta pis ton on eachextremity of said barjwanoperating. cylinder Venclosing each piston;.andi 'aiport 1in each cylinder p'ositione'dto be liricoVe'rdb'ytheAfront pressureiface-of thepiston'thereiri asi-,hea latterVY approachesthe extremity of itspwerf stroke, and to be uncovered by the backno-preissure Vs ide ofthefpis'tonas*v the vlatter"Y enters n itsrYex-hau'st stroke s that' filuid under Ypressure f'will Y bealternatelyadmitted from each power cylinder (References onV following page) I 5REFERENCES CITED Number The following references are of record in the 1le of th1s patent: 2:378:697

UNITED STATES PATENTS 5 Number Name Date 460,319 Courtright Sept. 29,1891 Number 726,871 Coryell May 5, 1903 7,958 853,774 Davies May 14,1907 Name Date Wayrynen Sept. 15, 1908 Spohrer Dec. 7, 1920 Geibel June19, 1945 FOREIGN PATENTS Country Date Great Britain Apr. 6, 1903

